def apidoc():
render = {}
render["DEFAULT_FEN"] = DEFAULT_FEN
render["status"] = 200
# Parse the FEN.
fen = request.args.get("fen")
if not fen:
render["status"] = 400
else:
try:
board = chess.Board(fen)
except ValueError:
try:
board = chess.Board()
board.set_epd(fen)
except ValueError:
render["status"] = 400
# Set the exact given FEN and a sanitized FEN for result.
if fen is not None:
render["fen"] = fen
if render["status"] == 400:
render["sanitized_fen"] = "8/8/8/8/8/8/8/8 w - - 0 1"
else:
render["sanitized_fen"] = board.fen()
if board.status() == chess.STATUS_VALID:
render["request_body"] = json.dumps(probe(board), indent=2, sort_keys=True)
else:
render["status"] = 400
# Render.
return html_minify(render_template("apidoc.html", **render))
def apidoc():
render = {}
render["DEFAULT_FEN"] = DEFAULT_FEN
render["status"] = 200
# Parse the FEN.
fen = request.args.get("fen")
if not fen:
render["status"] = 400
render["error"] = "fen required"
else:
try:
board = chess.Board(fen)
except ValueError:
render["status"] = 400
render["error"] = "invalid fen"
# Set the exact given FEN and a sanitized FEN for result.
if fen is not None:
render["fen"] = fen
if render["status"] == 400:
render["sanitized_fen"] = "8/8/8/8/8/8/8/8 w - - 0 1"
else:
render["sanitized_fen"] = board.fen()
if board.is_valid():
render["request_body"] = json.dumps(probe(board),
indent=2,
sort_keys=True)
else:
render["status"] = 400
render["error"] = "illegal fen"
# Render.
return html_minify(render_template("apidoc.html", **render))
def imprint():
return html_minify(render_template("legal.html"))
def index():
# Setup a board from the given valid FEN or fall back to the default FEN.
try:
board = chess.Board(request.args.get("fen", DEFAULT_FEN))
except ValueError:
try:
board = chess.Board()
board.set_epd(request.args.get("fen", DEFAULT_FEN))
except ValueError:
board = chess.Board(DEFAULT_FEN)
# Get FENs with the current side to move, black and white to move.
original_turn = board.turn
board.turn = chess.WHITE
white_fen = board.fen()
board.turn = chess.BLACK
black_fen = board.fen()
board.turn = original_turn
fen = board.fen()
wdl = None
winning_side = None
winning_moves = []
drawing_moves = []
losing_moves = []
if board.status() != chess.STATUS_VALID:
status = "Invalid position"
elif board.fen() == DEFAULT_FEN:
status = "Draw by insufficient material"
wdl = 0
elif board.is_stalemate():
status = "Draw by stalemate"
wdl = 0
elif board.is_checkmate():
wdl = 2
if board.turn == chess.WHITE:
status = "Black won by checkmate"
winning_side = "black"
else:
status = "White won by checkmate"
winning_side = "white"
else:
wdl = tablebases.probe_wdl(board)
dtz = tablebases.probe_dtz(board)
if board.is_insufficient_material():
status = "Draw by insufficient material"
wdl = 0
elif dtz is None:
status = "Position not found in tablebases"
elif dtz == 0:
status = "Tablebase draw"
elif dtz > 0 and board.turn == chess.WHITE:
status = "White is winning with DTZ %d" % (abs(dtz), )
winning_side = "white"
losing_side = "black"
elif dtz < 0 and board.turn == chess.WHITE:
status = "White is losing with DTZ %d" % (abs(dtz), )
winning_side = "black"
losing_side = "white"
elif dtz > 0 and board.turn == chess.BLACK:
status = "Black is winning with DTZ %d" % (abs(dtz), )
winning_side = "black"
losing_side = "white"
elif dtz < 0 and board.turn == chess.BLACK:
status = "Black is losing with DTZ %d" % (abs(dtz), )
winning_side = "white"
losing_side = "black"
for move in board.legal_moves:
san = board.san(move)
board.push(move)
move_info = {
"uci": move.uci(),
"san": san,
"fen": board.epd() + " 0 1",
"dtz": tablebases.probe_dtz(board),
"zeroing": board.halfmove_clock == 0,
"checkmate": board.is_checkmate(),
"stalemate": board.is_stalemate(),
"insufficient_material": board.is_insufficient_material(),
}
move_info["winning"] = move_info["checkmate"] or (move_info["dtz"] is not None and move_info["dtz"] < 0)
move_info["drawing"] = move_info["stalemate"] or move_info["insufficient_material"] or (move_info["dtz"] == 0 or (move_info["dtz"] is None and wdl is not None and wdl < 0))
if move_info["winning"]:
if move_info["checkmate"]:
move_info["badge"] = "Checkmate"
elif move_info["zeroing"]:
move_info["badge"] = "Zeroing"
else:
move_info["badge"] = "Win with DTZ %d" % (abs(move_info["dtz"]), )
winning_moves.append(move_info)
elif move_info["drawing"]:
if move_info["stalemate"]:
move_info["badge"] = "Stalemate"
elif move_info["insufficient_material"]:
move_info["badge"] = "Insufficient material"
elif move_info["dtz"] == 0:
move_info["badge"] = "Draw"
else:
move_info["badge"] = "Unknown"
drawing_moves.append(move_info)
else:
if move_info["dtz"] is None:
move_info["badge"] = "Unknown"
else:
move_info["badge"] = "Loss with DTZ %d" % (abs(move_info["dtz"]), )
losing_moves.append(move_info)
board.pop()
winning_moves.sort(key=lambda move: move["uci"])
winning_moves.sort(key=lambda move: move["dtz"], reverse=True)
winning_moves.sort(key=lambda move: move["zeroing"], reverse=True)
winning_moves.sort(key=lambda move: move["checkmate"], reverse=True)
drawing_moves.sort(key=lambda move: move["uci"])
drawing_moves.sort(key=lambda move: move["insufficient_material"], reverse=True)
drawing_moves.sort(key=lambda move: move["stalemate"], reverse=True)
losing_moves.sort(key=lambda move: move["uci"])
losing_moves.sort(key=lambda move: move["dtz"], reverse=True)
return html_minify(render_template("index.html",
fen_input=board.epd() + " 0 1" if board.epd() + " 0 1" != DEFAULT_FEN else "",
fen=fen,
status=status,
insufficient_material=board.is_insufficient_material(),
winning_side=winning_side,
winning_moves=winning_moves,
drawing_moves=drawing_moves,
losing_moves=losing_moves,
blessed_loss=wdl == -1,
cursed_win=wdl == 1,
illegal=board.status() != chess.STATUS_VALID,
not_yet_solved=board.epd() + " 0 1" == chess.STARTING_FEN,
unknown=wdl is None,
turn="white" if board.turn == chess.WHITE else "black",
white_fen=white_fen,
black_fen=black_fen,
horizontal_fen=mirror_horizontal(fen),
vertical_fen=mirror_vertical(fen),
swapped_fen=swap_colors(fen),
DEFAULT_FEN=DEFAULT_FEN,
material=material(board)
))
def imprint():
return html_minify(render_template("legal.html"))
def index():
# Setup a board from the given valid FEN or fall back to the default FEN.
try:
board = chess.Board(request.args.get("fen", DEFAULT_FEN))
except ValueError:
try:
board, _ = chess.Board.from_epd(
request.args.get("fen", DEFAULT_FEN))
except ValueError:
board = chess.Board(DEFAULT_FEN)
# Get FENs with the current side to move, black and white to move.
original_turn = board.turn
board.turn = chess.WHITE
white_fen = board.fen()
board.turn = chess.BLACK
black_fen = board.fen()
board.turn = original_turn
fen = board.fen()
wdl = None
winning_side = None
winning_moves = []
drawing_moves = []
losing_moves = []
if not board.is_valid():
status = "Invalid position"
elif board.is_stalemate():
status = "Draw by stalemate"
wdl = 0
elif board.is_checkmate():
wdl = 2
if board.turn == chess.WHITE:
status = "Black won by checkmate"
winning_side = "black"
else:
status = "White won by checkmate"
winning_side = "white"
else:
wdl = syzygy.probe_wdl(board)
dtz = syzygy.probe_dtz(board)
if board.is_insufficient_material():
status = "Draw by insufficient material"
wdl = 0
elif dtz is None:
status = "Position not found in tablebases"
elif dtz == 0:
status = "Tablebase draw"
elif dtz > 0 and board.turn == chess.WHITE:
status = "White is winning with DTZ %d" % (abs(dtz), )
winning_side = "white"
losing_side = "black"
elif dtz < 0 and board.turn == chess.WHITE:
status = "White is losing with DTZ %d" % (abs(dtz), )
winning_side = "black"
losing_side = "white"
elif dtz > 0 and board.turn == chess.BLACK:
status = "Black is winning with DTZ %d" % (abs(dtz), )
winning_side = "black"
losing_side = "white"
elif dtz < 0 and board.turn == chess.BLACK:
status = "Black is losing with DTZ %d" % (abs(dtz), )
winning_side = "white"
losing_side = "black"
for move in board.legal_moves:
san = board.san(move)
uci = board.uci(move)
board.push(move)
move_info = {
"uci": uci,
"san": san,
"fen": board.epd() + " 0 1",
"dtz": syzygy.probe_dtz(board),
"dtm": gaviota.probe_dtm(board),
"zeroing": board.halfmove_clock == 0,
"checkmate": board.is_checkmate(),
"stalemate": board.is_stalemate(),
"insufficient_material": board.is_insufficient_material(),
}
move_info["dtm"] = abs(
move_info["dtm"]) if move_info["dtm"] is not None else None
move_info["winning"] = move_info["checkmate"] or (
move_info["dtz"] is not None and move_info["dtz"] < 0)
move_info["drawing"] = move_info["stalemate"] or move_info[
"insufficient_material"] or (move_info["dtz"] == 0 or
(move_info["dtz"] is None
and wdl is not None and wdl < 0))
if move_info["winning"]:
if move_info["checkmate"]:
move_info["badge"] = "Checkmate"
elif move_info["zeroing"]:
move_info["badge"] = "Zeroing"
else:
move_info["badge"] = "Win with DTZ %d" % (abs(
move_info["dtz"]), )
winning_moves.append(move_info)
elif move_info["drawing"]:
if move_info["stalemate"]:
move_info["badge"] = "Stalemate"
elif move_info["insufficient_material"]:
move_info["badge"] = "Insufficient material"
elif move_info["dtz"] == 0:
move_info["badge"] = "Draw"
else:
move_info["badge"] = "Unknown"
drawing_moves.append(move_info)
else:
if move_info["dtz"] is None:
move_info["badge"] = "Unknown"
elif move_info["zeroing"]:
move_info["badge"] = "Zeroing"
else:
move_info["badge"] = "Loss with DTZ %d" % (abs(
move_info["dtz"]), )
losing_moves.append(move_info)
board.pop()
winning_moves.sort(key=lambda move: move["uci"])
winning_moves.sort(key=lambda move: (move["dtm"] is None, move["dtm"]))
winning_moves.sort(key=lambda move: (move["dtz"] is None, move["dtz"]),
reverse=True)
winning_moves.sort(key=lambda move: move["zeroing"], reverse=True)
winning_moves.sort(key=lambda move: move["checkmate"], reverse=True)
drawing_moves.sort(key=lambda move: move["uci"])
drawing_moves.sort(key=lambda move: move["insufficient_material"],
reverse=True)
drawing_moves.sort(key=lambda move: move["stalemate"], reverse=True)
losing_moves.sort(key=lambda move: move["uci"])
losing_moves.sort(key=lambda move: (move["dtm"] is not None, move["dtm"]),
reverse=True)
losing_moves.sort(key=lambda move: (move["dtz"] is None, move["dtz"]),
reverse=True)
losing_moves.sort(key=lambda move: move["zeroing"])
return html_minify(
render_template("index.html",
fen_input=board.epd() +
" 0 1" if board.epd() + " 0 1" != DEFAULT_FEN else "",
fen=fen,
status=status,
insufficient_material=board.is_insufficient_material(),
winning_side=winning_side,
winning_moves=winning_moves,
drawing_moves=drawing_moves,
losing_moves=losing_moves,
blessed_loss=wdl == -1,
cursed_win=wdl == 1,
illegal=not board.is_valid(),
not_yet_solved=board.epd() +
" 0 1" == chess.STARTING_FEN,
unknown=wdl is None,
turn="white" if board.turn == chess.WHITE else "black",
white_fen=white_fen,
black_fen=black_fen,
horizontal_fen=mirror_horizontal(fen),
vertical_fen=mirror_vertical(fen),
swapped_fen=swap_colors(fen),
clear_fen=clear_fen(fen),
DEFAULT_FEN=DEFAULT_FEN,
material=material(board)))